主要介绍datatable、日志log、文件流filestream、streamwriter类，将数据保存为txt和excel格式。
1.创建TestDataTable类
CreateTable()方法创建一个数据table，SaveTableToExcel(string fileName)方法将数据table存为文件名为fileName的excel格式文件，CreateDirectory(string fileName)方法去检查文件是否存在，若不存在，则自动创建一个。
class TestDataTable: DataTable
{ public void CreateTable()
{ this.Columns.Add("Time(s)", System.Type.GetType("System.String")); this.Columns.Add("Ch", System.Type.GetType("System.String"));
this.Columns.Add("BER", System.Type.GetType("System.String"));
const int length1 = 4;
const int length2 = 10; int[][] data = new int[length1][]; //第一条数据
data[0] = new int[length2] { 13, 25, 21, 33, 28, 39, 43, 36, 42, 36 }; //第二条数据
data[1] = new int[length2] { 20, 13, 10, 5, 15, 7, 10, 14, 19, 20 }; //第三条数据
data[2] = new int[length2] { 78, 92, 65, 83, 90, 59, 63, 72, 88, 98 }; //第四条数据
data[3] = new int[length2] { 45, 49, 39, 47, 52, 76, 67, 51, 57, 67 }; for (int i = 0; i < length2; i++)
{ for (int j = 0; j < length1; j++)
{
DataRow dr = this.NewRow();
dr[0] = i + 1;
dr[1] = j;
dr[2] = data[j][i]; this.Rows.Add(dr);
}
}
} public void SaveTableToExcel(string fileName)
{
CreateDirectory(fileName);
StringBuilder title = new StringBuilder();
FileStream fileStream = new FileStream(fileName, FileMode.OpenOrCreate);
StreamWriter writer = new StreamWriter(new BufferedStream(fileStream), System.Text.Encoding.Default);
for (int i = 0; i < this.Columns.Count; i++)
{
title.Append(this.Columns[i].ColumnName + "\t"); //栏位：自动跳到下一单元格
}
title.Append("\n");
writer.Write(title); foreach (DataRow row in this.Rows)
{
StringBuilder content = new StringBuilder(); for (int i = 0; i < this.Columns.Count; i++)
{
content.Append(row[i] + "\t");//内容：自动跳到下一单元格
}
content.Append("\n");
writer.Write(content);
}
writer.Close();
fileStream.Close();
} public void CreateDirectory(string fileName)
{
DirectoryInfo directoryInfo = Directory.GetParent(fileName);
if (!directoryInfo.Exists)
{
directoryInfo.Create();
}
}
}2.创建日志Log类
将文件名FileName定义为类的属性，在构造函数时赋值。SaveLogToTxt(string info)方法将数据info存入文件名为fileName的txt文件中。同样CreateDirectory()方法去检查文件是否存在
class Log
{ private string fileName;
public string FileName
{ set
{ this.fileName = value;
} get
{ return this.fileName;
}
} public Log(string fileName)
{ this.fileName = fileName;
CreateDirectory();
}
public void SaveLogToTxt(string info)
{
StreamWriter writer = null;
FileStream fileStream = null; try
{
System.IO.FileInfo fileInfo = new System.IO.FileInfo(this.fileName);
if (!fileInfo.Exists)
{
fileStream = fileInfo.Create();
writer = new StreamWriter(fileStream);
}
else
{
fileStream = fileInfo.Open(FileMode.Append, FileAccess.Write);
writer = new StreamWriter(fileStream);
}
writer.WriteLine(info);
}
finally
{
if (writer != null)
{
writer.Close();
writer.Dispose();
fileStream.Close();
fileStream.Dispose();
}
}
}
public void CreateDirectory()
{
DirectoryInfo directoryInfo = Directory.GetParent(this.fileName);
if (!directoryInfo.Exists)
{
directoryInfo.Create();
}
}
}3.调用类方法存数据
实例化类、创建数据table，将table保存为txt格式和excel格式，以时间命名。
TestDataTable dt = new TestDataTable();
dt.CreateTable();
dt.Rows.Clear(); //清除数据table里所有行DateTime startTime = DateTime.Now;
Log log = new Log(@"Log\" + startTime.ToString("yyyyMMddHHmmss") + ".txt");//以时间为文件命名，存在exe所在文件夹下的Log文件夹里for (int i = 0; i < 4; i++)
{
DataRow dr = dt.NewRow();
dr[0] = (int)second;
dr[1] = i;
dr[2] = BERByChannel[i].ToString("E2");
dt.Rows.Add(dr);//添加新行到数据table
string info = string.Format("{0}: Time(s): {1}, Ch: {2}, BER: {3}", DateTime.Now, dr[0], dr[1], dr[2]);
log.SaveLogToTxt(info);//存为txt格式 }//存为excel格式string fileName = @"TestRecord\" + startTime.ToString("yyyyMMddHHmmss") + ".xls";
dt.SaveTableToExcel(fileName);//以时间为文件命名，存在exe所在文件夹下的TestRecord文件夹里以上就是 从0自学C#03--文件流保存数据为txt/excel格式的内容，更多相关内容请关注PHP中文网（www.php.cn）！
